class Point {
	double x, y;

	public Point(double _x, double _y) {
		x = _x;
		y = _y;
	}

	public double getDistance(Point p) {
		return Math.sqrt((x - p.x) * (x - p.x) + (y - p.y) * (y - p.y));
	}
}

public class TestConstructor {
	public static void main(String[] args) {
		Point p = new Point(3.0, 4.0);
		Point origin = new Point(0.0, 0.0);
		System.out.println(p.getDistance(origin));
	}
}